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High‐Temperature‐Resistant, Mechanically Stable FeCrNiAl/Al2O3 Thermally Sprayed Thick Ceramic Coatings for Stealth Applications over X‐Band

“…Further, the XRD spectrum of Fe 80 Cr 10 Ni 5 Al 5 powder produced by atomization shows characteristic X‐ray diffraction peaks corresponding to cubic crystal planes (110), (200), and (211) of α‐Fe(CrNiAl), without any residual or impurity phases (Figure 2b). [ 14 ] The XRD pattern of the representative FeCrAlNi/Al 2 O 3 composite powder granules (50:50 wt%), which was used as feedstock powder for thermal spraying, confirms the phase compositions of α‐Al 2 O 3 (≈61.0%), as well as FeCrNiAl (about 39.0%) in the composite powder (Figure 2c). Figure 2d–f shows the XRD spectra of thermally sprayed coating surfaces of 40% FeCrNiAl/60% Al 2 O 3 , 50% FeCrNiAl/50% Al 2 O 3 , and 40% FeCrNiAl/60% Al 2 O 3 , respectively.…”